| Titre : |
Contact angle measurements for characterisation of wetting properties of surfactants : Method guideline and inter-laboratory tests by the CESIO-TMS group |
| Type de document : |
texte imprimé |
| Auteurs : |
Dennis J. Miller, Auteur |
| Année de publication : |
2016 |
| Article en page(s) : |
p. 52-63 |
| Note générale : |
Glossaire - Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Angle de contact
Goniométrie
Mouillage (chimie des surfaces)
Surfactants
|
| Index. décimale : |
668.5 Parfums et cosmétiques |
| Résumé : |
Wetting of solids by surfactant solutions is involved in a variety of applications. An important technique for studying wetting is the measurement of contact angle with the goniometric method. A drop of liquid, placed on a flat surface, is photo¬graphed and the image analysed to give the angle at the edge.
Reproducibility problems are often encountered in contact angle work. These are related to dynamic effects, surface irregularities and surface contamination. Also, there are various measurement procedures, which can give considerably different numerical values of the angle.
This guideline provides an introduction to the theory, an overview of experimental methods and advice on how to obtain reliable contact angles. The different types of contact angles and the corresponding measurement procedures are explained. Typical values for reproducibility, based on both literature and our own inter-laboratory studies, are given. |
| Note de contenu : |
- SURFACTANTS : WETTING AND CHEMICAL STRUCTURE
- MEASUREMENT OF CONTACT ANGLES : Overview : Goniometer method - Wilhelmy method - Capillary rise
- GONIOMETER METHOD : Equipment and procedures : Sessile drop - Captive bubble - Tilting plate - Dynamic advancing contact angle (captive needle mode) - Static advancing contact angle (captive needle mode or detached drop) - Dynamic receding contact angle (captive needle mode) - Empirical fit near edge of drop - Simplified evaluation of whole contour - Young-Laplace method
- REDUCING EXPERIMENTAL PROBLEMS : Dosing rate - Drop shape : symmetry and constancy - Kinetic energy effects - Evaporation - Depletion effects - Adjusting the optical system - Baseline - Handling the solid surface - Repeat measurements with same surface - Humidity - Temperature
- REPRODUCIBILITY
- SUBSTRATES
- GENERAL RECOMMENDATIONS FOR TESTING SURFACTANTS |
| En ligne : |
https://drive.google.com/file/d/1XYjfsenb-M7fwMz_mwFNiX5uJLyu49q7/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27872 |
in SOFW JOURNAL > Vol. 142, N° 12 (12/2016) . - p. 52-63
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Contact angle measurements for characterisation of wetting properties of surfactants in SOFW JOURNAL, Vol. 142, N° 12 (12/2016)
